Exits of the Cranial Nerves and their Subarachnoid pathway

Question 1

CN1

Answer 1

Called: Olfactory N

• Brain Exit: Olfactory bulb
• Subarachnoid pathway: -
• Dural Exit: Cribiform Plate
• Skull Exit: Cribiform Plate

Question 2

CN2

Answer 2

Name: Optic N

• Brain Exit: Optic Chiasm
• Subarachnoid pathway: Chiasmatic Cistern
• Dural Exit: Posterior Pole of Eyeball
• Skull Exit: Optic Canal

Question 3

CN3

Answer 3

Name: Occulomotor N

• Brain Exit: Interpenduncular Fossa
• Subarachnoid pathway: Interpenduncular Cistern
• Dural Exit: Lateral wall of the Cavernous sinus (enters between the Anterior and Posterior Petroclinoid Folds)
• Skull Exit: Superior Orbital Fissure

Question 4

CN4

Answer 4

Name: Trochlear N

• Brain Exit: Found below the Inferior Colliculus (of Mid brain)
• Subarachnoid pathway: Quadrigeminal Cistern then Ambient Cistern
• Dural Exit: Lateral wall of the Cavernous Sinus
• Skull Exit: Superior Orbital Fissure

Question 5

CN5

Answer 5

Name: Trigeminal Nerve

• Brain Exit: Btw the Pons and Potine Brachium (sensory root = Inferior, motor root = superior)
• Subarachnoid pathway: Pontocerebellar Cistern
• Dural Exit: Trigeminal Cave (V1,V2= Cavernous Sinus, V3= Foramen Ovale)

-Skull Exit: V1 = Superior Orbital Fissure
V2 = Foramen Rotundum
V3 = Foramen Ovale

Question 6

CN6

Answer 6

Name: Aducent Nerve

• Brain Exit: At the PontoMedullary Junction (on either side of the Foramen Cecum)
• Subarachnoid pathway: PontoMedullary Cistern
• Dural Exit: Cavernous Sinus
• Skull Exit: Superior Orbital Fissure

Question 7

CN7

Answer 7

Name: Facial Nerve

• Brain Exit: Btw Pons and Pontine Brachium Posteriorly
• Subarachnoid pathway: PontoCerebellar Cistern
• Dural Exit: Fundus of the Internal Acoustic Meatus
• Skull Exit: Fundus of the Internal Acoustic Meatus

Question 8

CN8

Answer 8

Name: Vestibocochlear N

• Brain Exit: btw Pons and Pontine Brachium Posteriorly
• Subarachnoid pathway: PontoCerebellar Cistern
• Dural Exit: Internal Acoustic Meatus
• Skull Exit: Internal Acoustic Meatus

Question 9

CN9

Answer 9

Name: Glossopharyngeal N

• Brain Exit: Lateral Paraolivary Sulcus (most superiorly)
• Dural Exit: Jugular Foramen (Anterior Part)
• Skull Exit: Jugular Foramen (Anterior Part)

Question 10

CNX

Answer 10

Name: Vagus Nerve

• Brain Exit: Lateral Paraolivary Sulcus
• Dural Exit: Jugular Foramen (ant part)
• Skull Exit: Jugular Foramen (ant part)

Question 11

CN11

Answer 11

Name: Accessory Nerves

• Brain Exit: Lateral Paraolivary sulcus
• Dural Exit: Jugular Foramen (ant Part)
• Skull Exit: Jugular Foramen (ant Part)

Question 12

CN12

Answer 12

Name: Hypoglossal N

• Brain Exit: Medial Paraolivary Sulcus
• Dural Exit: Hypoglossal Canal
• Skull Exit: Hypoglossal Canal